Architects, civil engineers, toy companies, NASA, bio-medical research companies, and the data storage industry are all recent users of technologies that developed from research in MSE. Most fields in science and engineering are concerned in some way with materials, but only the field of materials science and engineering focuses directly on them.
Permanent hair dye lasts up to eight weeks. A hair dyeing kit. Semi-permanent hair dye cannot be used to lighten hair. Henna can be used to make a semi-permanent hair dye. Semi-permanent hair color lasts about six weeks or up to about 24 shampoos. When dying hair, it's recommended to wear gloves to prevent staining the hands.
It contains no ammonia but does have a small amount of peroxide, which opens the hair cuticle slightly so that some color will be absorbed. Demi-permanent does a better job of darkening hair than semi-permanent does, but it doesn't lighten hair. Demi-permanent hair color will fade and typically last 12 to 24 shampoos.